The <from-entity> specified in
queries using the XML input format is a comma-separated list of
paths or URLs of XML files.
Filenames or URLs can be optionally followed by an XPath that
specifies which node(s) in the document are to be considered root
node(s).
Filenames can include wildcards (e.g. "LogFiles\doc*.xml").
Examples:
FROM Document1.xml, http://blogs.msdn.com/MainFeed.aspx
FROM Document1.xml#/rss/channel/item, http://blogs.msdn.com/MainFeed.aspx#/rss/channel/item